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both "-" are ground, same ground, it doesnt matter. You just need to worry about "+" so +IN is 12V and +OUT is 5V, double check with multimeter if there is 5V on output, if not you have small screw there to regulate it. It is pretty stable. I love those small bucks :)

haha right :) I didn't mean about practises and environment what they have there, I meant your safety to NOT be poisoned by some additives or heavy metals. Sounds ridiculous but actually very small traces of some compounds might be bad for you. I work in molecular biology lab and we had cases of...

Nice to hear that someone is using my designs :) I am not sure what this PCB house is making but check if it is not toxic, I heard some has toxic components and heavy metals on surface like lead. Dirty Cheap is also a prototyping (i think you have chosen this option) so not all of them may...

that you can calculate, but if its similar to bc337 you are fine, take notice that GPIOs from raspberry are 3v3 only and 20mA max. But still most of transistors would work. You could have a bigger problem with MOSFETs but there are also logic level mosfets which will work.

800mA is not a saturation from base, its a current limit collector-emitter i think, so basically how much SSR can draw which is fine because it use ~20mA.

2n3906 is PNP not NPN. I have never used them to I do not know but if they meet requirements they should work, just check datasheets and compare to bc337 for example, check maximum ratings. In our case there are no high currents or voltages here.

i guess you can, you can basically use any NPN transistor which will saturate with given current and be more than lets say 500mA you can also use some mosfets but then the pinouts might be different

software is not mine, i have completely no connection with software, i just designed a PCB. I thought you want physical button not button in the software. I believe there is already one inside software where you can pause and resume.

so you want physical button to use stop in the software? For this you can add button to I2C for example. I am not sure but probably you can also add button directly to GPIO. But all this need to have software support.

what is e-stop? EDIT: oh right, emergency stop, so you can just put normal switch to your power cable, you can even buy emergency switch

3.0 or so I guess :) But anyway on every board is I2C bus, doesn't take much space but might be useful for the future.

2.1 was just a project never made actually, I2C is a bus which can be used to connect LCD or anything else (buttons or whatever). Using I2C you need only 2 data pins to connect stuff. To connect you need a special interface something like this for example...

this you connect through SSR

well I do not know what is on the German forum :) can you provide a link? My German i bad but maybe I will get something. I have seen only a pics on FB site that it is connected through I2C. I do not see how you can connect it otherwise. It will take so many GPIOs.

it is written "for arduino" but that should be the same, and I can see on youtube or other sources that it works. If not it is just a half buck :)

do not overpay for this, its simple circuit and here you have for half buck...

yes something like this but not sainsmart, I bought some other brand but looks completely the same :)

This will probably replace my old ardbir setup in my main rig :) I just need to plan everything and make some new box etc. Hope I can get LCD through I2C interface with main info about temps, time etc, then It would be perfect.

Yes you have to wire SSR's or small relays outside the board. That's probably better as mostly people use SSR for some things and it makes board smaller as well.

yes of course, i forgot about new gerbers on github, will upload it soon